If you looked at installed solar generation capacity 30 years ago then the situation would have looked hopeless too. But there has since been an exponential increase, driven by increases in both rate installation, and in our capacity to manufacture and install panels.

And there is every reason to think that we at the start of similar curve with battery storage right now (batteries are currently manufactured at a relatively small scale, with no major technological barriers to scaling up). Seasonal storage is another matter, but hourly/daily is well within reach.